Pumping device and central control unit



Se t. 17, 1968 o. J. SCHWERTFEGER ETAL 3,401,639

PUMPING DEVICE AND CENTRAL CONTROL UNIT 3 Sheets-Sheet 1 Filed Dec. 16, 1965 p 1968 o. J. SCHWERTFEGER ETAL 3,401,639

PUMPING DEVICE AND CENTRAL CONTROL UNIT 3 Sheets-Sheet Filed Dec. 16, 1965 QM mm .wh mm mm mm INVENTORS OWEN J. SCHWERTFEGER Bf 'R/INK D. BRILL S A Q 331% 8% msm mum wmw Sept. 17, 1968 O. J. SCHWERTFEGER ETAL PUMPING DEVICE AND CENTRAL CONTROL UNIT Filed Dec. 16, 1965 5 Sheets-Sheet 5 PRSZ PRS3

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PRS5- F PRSPgktA I Lies *f L2l L25) LIB SPM INVENTORS OWEN J. SCHWERTFEGEI'? FRANK D. BRILL United States Patent Oflice 3,401,639 Patented Sept. 17, 1968 3,401,639 PUMPING DEVICE AND CENTRAL CONTROL UNIT Owen J. Schwertfcger, Chicago, and Frank D. Brill, Norridge, Ill., assignors to The Seeburg Corporation, Chicago, 111., a corporation of Delaware Filed Dec. 16, 1965, Ser. No. 514,243 13 Claims. (Cl. 103-41) ABSTRACT OF THE DISCLOSURE A device adapted to selectively pump metered volumes of liquids features a plurality of individual metering pumps, including a pumping chamber and reciprocal piston means for altering the volume thereof. Each metering pump may be engaged by a single power source through the actuation of selection means. The selection means include a plurality of clutch means which are adapted when actuated to effect driving engagement between drive means and associated cam means, which in turn, effect driving engagement with the associated metering pump. Control means for selectively actuating the clutching means are provided and comprise retainer means, in association with each clutch means, which normally maintain the clutch means in a declutched position, but which, when momentarily actuated, release the clutch to its clutched position. Means are also provided to permit the selective actuation of a predetermined one of the retaining means. In addition a plurality of cam means responsive to drive means perform various central control functions in a beverage dispensing unit in which the disclosed invention is disposed.

This invention relates to pumping devices and more particularly to a pumping device comprising a plurality of individual metering pumps and a single power source in which each ump is selectively interengageable with the power source by means of a novel mechanical clutching arrangement. The invention further relates to a pumping device which is adapated to perform various control functions for other components of a beverage dispensing unit in which the device is incorporated.

A modern vending machine adapted to formulate and dispense beverages in cup size quantities from a beverage base and water typically offers a customer a number of flavors from which to choose (cola flavor and one or more fruit flavors, for example). In addition, such a machine often oifers the customer a choice as to whether he desires that the beverage be formulated with carbonated or plain (i.e., noncarbonated) water and whether or not he desires ice to be dispensed with the beverage. A vending machine of this character requires a series of metering pumps, one for each flavor of beverage base. In addition, due to the relatively large number of selection options given the customer, means must be provided to control the systematic operation of the various components of the machine in response to the customers initiation of a selected vend cycle. The present invention provides an arrangement adapted to simply, yet quickly and efficicntly, perform all of the foregoing pumping and central control functions.

Briefly described, the subject invention comprises a plurality of individual metering pumps, each adapted to pump a predetermined metered amount of liquid upon actuation; drive means adapted, when engaged with a given one of the metering pumps, to cause the pump to carry out a pumping cycle; clutching means for each metering pump, each clutching means being adapted, when actuated, to effect engagement between a corresponding metering pump and the drive means; and control means for selectively actuating the clutching means. In addition, the present invention preferably further comprises a plurality of cam means responsive to the drive means for performing various central control functions in a beverage dispensing unit in which the present invention is disposed.

A primary object of the present invention is to provide a pumping device in which a single source of motive power is utilized to selectively drive a given one of a plurality of metering pumps.

Another object of the present invention is to provide a pumping device of the character described in which novel mechanical clutching means are utilized to elfect a driving engagement between the motive power source and the metering pumps.

A further object is the provision of a pumping device of the character described in which actuation of the clutching arrangement so as to effect engagement of the motive power source and a given metering pump is accomplished by momentary energization of a solenoid in response to customer selection.

Yet another object is to provide mechanical elements and electrical circuitry in connection with a pumping device of the character described in order to carry out various central controlling functions for the other components of a beverage dispensing unit in which the device is incorporated.

These and other objects, advantages, and features of the present invention will hereinafter appear, and, for purposes of illustration, but not of limitation, an exemplary embodiment of the present invention is shown in the accompanying drawings, in which:

FIGURE 1 is a front elevational view of a preferred embodiment of the present invention;

FIGURE 2 is an enlarged, fragmentary rear elevational view of one of the pumping cylinders;

FIGURE 3 is a rear elevational view of a cam and switch arrangement utilized in the present invention;

FIGURE 4 is an enlarged, fragmentary sectional view of one of the pumping chambers;

FIGURE 5 is a sectional view taken along line 5-5 in FIGURE 1;

FIGURE 6 is a sectional view taken along line 6-6 in FIGURE 1;

FIGURE 7 is a sectional view taken along line 7-7 in FIGURE 1;

FIGURE 8 is a bottom perspective view of the embodiment shown in FIGURE 1; and

FIGURE 9 is a schematic electrical diagram of the circuitry utilized in accordance with the present invention.

With reference to the drawings, FIGURE 1 shows a pumping device 12 comprising a base channel 14 and an upper support 16 which are interconnected by a plurality of brackets 18. A horizontal top plate 19 is provided, and plate 19 is held in place by a plurality of bolts 21, each of which is welded to an upper end of one of the brackets 18.

Four metering pumps, each of which is generally designated by the reference character 20, are mounted on top plate 19 as shown in FIGURE 1. Each of the pumps 26 is identical in structure and comprises a hollow cylinder 22, the bottom edge of which is formed into a flange 24. A pump base 26 has a downwardly curvedly projecting portion 28 which fits into an opening formed in top plate 19. A flexible gasket 30 is adapted to fit, at its outer edge, between flange 24 and cylinder base 26, whereby when cylinder 22 is tightly clamped to base 26 (in a manner hereinafter described) the gasket 30 will be held firmly in place.

Gasket 30 has a center opening through which passes a piston shaft 32 of a piston 34. Piston shaft 32 has a shoulder 36 formed thereon so as to firmly hold the gasket to the shaft 32 as the latter reciprocates vertically. An annular sealing gasket 38 is provided around the edge of piston 34 so as to form an airtight seal as piston 34 reciprocates within cylinder 22. Gasket 30 is stretched to the position shown in FIGURE 1 when the piston 34 is disposed in its raised position and is gathered together within the curved portion 28 of base 26 when piston 34 is disposed in its lowered position.

A clamp 40 is provided in order to firmly anchor the cylinder 22 and the pump base 26 to the top plate 19. Clamp 40 has a pair of downwardly extending side arms 42, each of which passes through an opening in top plate 19 and is held in place by a retaining ring 44. A cover plate 46 is adapted to fit over cylinder 22, and a bushing 48 (see FIGURE 2) is threaded to a threaded shaft 50 which is fixed to the top of clamp 40. Thus, when bushing 48 is threaded downwardly on shaft 50, cover plate 46 is pushed dowwardly against cylinder 22, and cylinder 22, gasket 30, and pump base 26 are firmly held against top plate 19. In addition, plate 46 serves to hold the valves (hereinafter described) in position as generally shown in FIGURE 2.

An inlet opening 52 and an outlet opening 54 are provided in the top of cylinder 22. A pair of fluid delivery tubes 56, 58 are respectively seated in openings 52, 54 in the manner generally shown in FIGURE 4. Thus, an O ring is provided in order to seal tube 56 in opening 52, and a similar 0 ring is provided in order to seal tube 58 in opening 54. As previously noted, plate 46 is adapted to hold tubes 58, 60 in place. Delivery tube 56 is adapted to supply fluid to cylinder 22, and delivery tube 58 is adapted to carry fluid away from cylinder 22 upon the actuation of piston 34 in a manner hereinafter to be described. In order to facilitate proper fluid flow, check valves are provided in openings 52, 54 adjacent the interconnections with tubes 56, 58. For example, a check valve 62 is provided in opening 52 and check valve 62 serves to prevent fluid from being pumped back out delivery tube 56 during the pumping operation. Likewise, another check valve (not shown) is provided in opening 54, and this check valve is adapted to prevent fiuid from being drawn back into cylinder 22 from delivery tube 58 as cylinder 22 is being refilled after the power stroke of piston 34.

The reciprocation of piston 34 within chamber 22 between its raised and lowered positions accomplishes a pumping operation. On its upstroke, a metered volume of beverage base is forced out through outlet 54. On its I downward stroke, beverage base is drawn into chamber 22 through inlet 52. Thus, when piston 34 is disposed in its rest position (i.e., its lowered position), chamber 22 is filled with beverage base.

Motion is transmitted to each of the piston shafts 32 by means of a vertically reciprocable plate (see FIG- URES 1 and 5-7). As best shown in FIGURE 1, the upper end of plate 70 has an upwardly projecting cylindrical connecting member 72 attached thereto, and member 72 has an upwardly directed projection formed thereon which is adapted to be received within an opening formed in the lower end of shaft 32. Member 72 is fixedly held to shaft 32 by a threaded attaching member 74.

Plate 70 has a vertical slot 76 formed therein (see FIGURES 6 and 7) through which passes a drive shaft 78 (described in detail hereinafter) so that plate 70 may reciprocate vertically with reference to drive shaft 78. A cam follower mounting plate 80 is provided with a vertically oriented slot 81 (see FIGURE 5 the upper end of which is opened for a purpose that will hereinafter appear. Plate 80 is mounted adjacent plate 70 as shown in FIGURES 1 and 5 so that slot 81 overlies slot 76. A shaft 82 passes through overlapping openings (not shown) in plates 70, 80, and a roller follower 84 is rotatably mounted with respect to shaft 82 and is retained thereon by means of a clip 86. Shaft 82 is retained by a nut 88 (sec FIGURE 5) adjacent plate 80. As previously noted, the upper end of the vertical sliding plate 80 is open. A stroke adjusting plate 182 (see FIGURE 5), having a slot 104 formed therein which overlies slot 76 in plate 70, is slidably mounted in the open end of plate 80 adjacent plate 70. A shaft 99 passes through plates 70 and 102 above the slots formed therein and a roller follower 92 is rotatably mounted with respect thereto adjacent plate 70 and is retained on shaft 98 by means of a clip 94. Means are provided for anchoring shaft adjacent plate 102.

Roller followers 84, 92 are provided so that, when a normally free floating cam 16%) (see especially FIGURE 7) is rotatably driven by shaft 78 (in a manner hereinafter described), cam 10% engages roller follower 92 and causes plate 70 to be driven upwardly. In turn, piston 34 is driven upwardly in cylinder 22 to its raised position. Continued rotation of earn 100 results in the profile thereof engaging roller follower 84 so as to positively drive plate 70 downwardly. Thus, piston 34 moves to its lowered position. It will be obvious to one skilled in the art that the relative positions in which the roller followers 84, 92 are disposed adjacent the contour of cam 100 determines the length of the pumping stroke of piston 34 and hence regulates the metered volume of liquid pumped out through fluid delivery tube 58.

Means are provided in order to adjust the relative intercenter distances of roller followers 84, 92 so as to permit adjustment of the piston stroke and hence the metered volume pumped of liquid. Shaft 98 passes through a slot (not visible in the drawings) in plate 70 so that as plate 182 is moved vertically with respect to plate 80, the roller follower 94 also moves vertically with respect to plate 7 0. Thus, by adjusting the relative position of plates 1G2 and 80, the distance between roller followers 84, 92 may be adjusted.

In order to positively position plate 102 with respect to plate 89 the following arrangement is utilized. A pair of horizontal flanges 106 are provided at the upper end of plate 78, and a horizontal member 108, having slots formed in each end, is fixed to flanges 106 as shown in FIGURE 5. A horizontal flange 118 is provided at the upper end of plate 102, and flange 119 has a slot therein adapted to receive and positively position the head of an adjusting screw 112. A threaded shaft 1714 of screw 112 is adapted to be received in a threaded opening in member 108. Thus, rotation of screw 112 causes the plate 182 to move with reference to plate 88, thereby varying the distance between roller followers 84, 92. Thus, by merely rotating threaded screw 112, the metered volume of liquid pumpable from the cylinder 22 may be adjusted.

As previously noted, cam 101 which is normally free floating with respect to shaft 78, is configured so as to result in the desired reciprocal motion of plates 70, 80 when cam 00 engages the roller followers 84, 92 as previously described. Each of the four metering pumps 20 is provided with the previously described arrangement of reciprocable plates and roller followers. Accordingly, four free floating cams 109 are provided on shaft 78 (see FIGURE 1), one for each of the metering pumps.

Means are provided for selectively effecting driving engagement between a predetermined one of the cams 100 and the shaft 78 so that the corresponding metering pump 20 may be actuated in response to customer selection. Since the operation of each cam 180 and its associated parts is identical, the following description should be considered to be applicable to each of the cams 100 and its associated parts.

A driving earn 120 is fixedly mounted on shaft 78 adjacent each free floating cam 100 (see FIGURES 1 and 6). Cam 129 is locked to shaft 78 by means of a pin 122 (shown in broken lines in FIGURE 6) which passes through a hub 124 of cam 120 and also through shaft 78.

Mechanical latching means are provided for interlocking driving cam 120 with its corresponding free floating cam 100. A notch 126 is provided in the outer edge of cam 12!) (see FIGURE 6), and a latch member 128 is pivoted to cam 100 by means of a pivot shaft 138. Latch 128 is retained on shaft 130 by a clip 132 (see FIGURE 6). One end of latch 128 has a projecting lip 134 formed thereon, and lip 134 is adapted to fit into notch 126 when latch 128 is positioned as shown in FIGURE 6. Thus, with latch 128 positioned as shown in FIGURE 6, when cam 120 is rotatably driven by shaft '78, latch 128 on cam 100 is drivingly interconnected with cam 120 (via lip 134 and notch 126). However, when latch 128 is pivoted in a clockwise direction (as shown in FKGURE 6), lip 134 moves out of notch 126, and cam 121i rotates without drivingly engaging latch 128, and hence cam 180 is not rotatably driven. A spring 136 (shown in broken lines in FIGURE 6) is stretched betwen a pair of studs 138, 140 respectively provided on earn 120 and latch 128 so as to bias latch 128 toward the position shown in FIG- URE 6.

Means are provided for normally maintaining latch 128 out of driving engagement with earn 128 in opposition to the bias of spring 136. As best shown in FIGURE 1, four of U brackets 142, one for each metering pump 20, is mounted on supporting channel 14 by conventional means. A slot (not shown) is provided in each leg of the U brackets 142, and a latch retainer 14 is slidably mounted in the siots. The left-hand end of latch retainer 144 (as seen in FIGURE 1) is cut away, and a notch 146 is formed in the left-hand end of latch 128 (as seen in FIGURE 6). Thus, when notch 146 engages the cutaway portion of retainer 144, latch 128 will be maintained in a position such that 134 does not engage notch 126, and rotation of driving cam 120 does not effect the rotation of cam 100. In order for latch 128 to be engaged with retainer 144, cam 100 must be disposed in a position which is clockwise relative to the FIGURE 6 disposition (which is the position cam 1% assumes, under the influence of gravity, when released from retainer 144). Thus, when retainer 144 is disengaged from notch 14s (as by retainer 144 moving toward the right as shown in FIG- URE 1), cam 180 moves to the free-floating gravity position shown in FIGURE 6 and latch 128 pivots in a counterclockwise direction (as shown in FIGURE 6) under the influence of spring 136-. Thus, lip 134 is free to move into notch 126 when the lip and notch are indexed with respect to each other.

Thereafter, as previously noted, cam 181) is rotatably driven by cam 120. After cam undergoes the remainder of a complete revolution (causing the corresponding piston 34 to carry out one pumping stroke), notch 146 again engages the cut-away portion of retainer 144, which has been restored to its original disposition. As notch 145 engages retainer 144, latch 128 pivots in a clockwise direction and lip 134 thereof moves out of notch 126, thereby effecting the disengagement of cams 100, 120. At this point the motor 16% is deenergized in a manner that will hereinafter be described. Momentary movement of one of the retainers 144 thus conditions the corresponding cam 100 for a full cycle of rotation. In this manner (i.e., by momentarily dispiacing a predetermined one of the retainers 144), the clutching mechanism (i.e., earns 18%, 120 and their associated parts) for the corresponding metering pump 28 is actuated.

Means are provided for selectively displacing a predetermined one of the retainers 144. A plurality of solenoids 159 (see FiGURE 8), one for each retainer 144, are mounted beneath supporting channel 14 by suitable means. A plunger 152 of each solenoid 159 is linked to the corresponding retainer 144 by means of a yoke 154 (see FIGURES l and 6) which passes through an opening 156 in channel 14. Thus, momentary energization of a given one of the solenoids 158 (in a manner hereinafter to be described) momentarily displaces the corresponding retainer 144, in turn releasing the corresponding latch 128 whereby the corresponding cams 100, 120 are conditioned for engagement. In this manner, momentary energization of a predetermined one of the solenoids conditions the corresponding metering pump 20 for carrying out a one cycle pumping operation.

A conventional motor 160 is mounted at one end of the pumping device 12 on one of the brackets 18, and the motor drive shaft (not shown) is coupted to drive shaft 78 by means of a conventional coupling 162 and a driving pin 164 (see FIGURE 1). A plurality of timing cams 17 0-173 (see FIGURE 1) are provided at the other end of shaft 78, and a plurality of switches (not shown) are provided, the actuating arms of which engage the profiles of cams 173 to perform various switching and timing functions. Cam 170, together with its associated switch, functions as a motor carry-over switching cam in a manner that will hereinafter be described. Cam 171 and its associated switch perform a switching function adapted to condition the beverage dispensing unit (not shown) in which the device 12 is incorporated to dispense ice with the beverage, at the customers option.

Cam 172 and its associated switches are adapted to control the dispensation of metered volume of water which is combined with the beverage base pumped from one of the pumps 28. Cam 173 and its associated switch are adapted to condition the beverage dispensing unit to provide, in response to customer selection, a carbonated water drink containing no beverage base (i.e., no flavoring syrup).

Three other normally free-floating timing cams are provided on shaft 78. Each of the cams 181) is attached, via a collar 186, to a corresponding one of the free floating cams 1%, whereby when the corresponding free floating cam is brought into driving engagement with its driving cam 121), the timing cam 181) is also rotatably driven. Thus, the given timing earn 180 carries out its switching function only during the performance of a pumping operation by the corresponding metering pump 20.

As shown in FIGURES 3 and 5, a switch 188 is mounted on supporting channel 14 by means of a. bracket 190, and an actuating arm 192 of switch 188 engages the profile of the corresponding cam 180 whereby rotation thereof causes switch 188 to open and close at predetermined intervals during the operational cycle. In the described embodiment, the cams 189 and associated switches 188 serve to control the dispensation of carbonated water to be mixed with the beverage base which is metered through the corresponding pump 20. No cam corresponding to cam 180 is provided in association with the righthand pump 20 (as shown in FIGURE 1), since the beverage base dispensed through this pump is mixed with plain (i.e., noncarbonated) water. However, as shown in the drawing, a collar 186 is provided in association with the right-hand cam 100 so that a cam 180 could be provided in association therewith if desired.

Mechanical means are provided in order to perform further switching functions during the operational cycle. As best shown in FIGURE 8, a bar 200 is slidably mounted with respect to supporting channel 14 by means of a pair of studs 282 which pass through a pair of slots 284 in bar 200. A stud 206 extends laterally from the lunger 152 of each of the solenoids 150, and each stud 2% passes through a corresponding slot 208 in bar 206. Studs 206 are disposed with reference to slots 208 so that actuation of a given solenoid 158 causes bar 201'? to move toward the right (as shown in FIGURE 8) without moving the plungers 152 of the other solenoids 150. A right-hand end portion 210 of bar 200 is positioned adjacent an actuating arm 212 of a switch 214 such that the momentary lateral movement of bar 260 (in response to the actuation of one of the solenoids 150) accomplishes a credit cancelling switching function, the purpose of which will hereinafter appear.

In addition to the previously described solenoids 159, a similar solenoid 158 is mounted beneath supporting channel 14. A plunger 152' of solenoid 150' has a stud 206' which passes through a slot 208' in bar 200. Thus,

7 momentary energization of solenoid 150' results in the actuation bar 200 and switch 214, but does not effect the driving engagement of a metering pump. As will hereinafter be described in detail, solenoid 150 is energized when a customer selects a drink comprised solely of carbonated water (i.e., without any beverage base).

The mechanical operation of the present invention may briefly be described as follows. When coins of a sulficient value have been deposited in a vending unit in which the pumping device 12 is incorporated, motor 160 is energized by means of electrical circuitry hereinafter described and the motor undergoes a partial revolution until its circuit is broken by means of cam 170 and its associated switch. A customer, by selecting a desired beverage flavor (corresponding to a particular beverage base or to a beverage which does not contain a beverage base), momentarily energizes the solenoid 150 or 150' for that flavor. If the customer has chosen a beverage comprising a beverage base, one of the solenoids 150 is energized. If the customer has selected a beverage consisting solely of carbonated water, solenoid 154i is energized.

The energization of one of the solenoids 156 serves to condition the corresponding cam 109 for driving engagement with its associated cam 12d. Retainer 144 is momentarily moved so as to release the latch 1128, thereby freeing latch 128 and cam 100 to move to a position wherein lip 134 on the latch engages notch 126 on cam 120. Thus, when motor 169 is reenergized, the cam 1G0 (and hence piston 34) will complete a pumping cycle. The energization of one of the solenoids 150, 150 causes bar 280 to move laterally so as to actuate switch 214. The actuation of switch 214, as will hereinafter be explained in detail, initiates a credit cancelling function, as a part of which motor 160 is reenergized so that shaft 78 is rotated through the remainder of a full revolution. As cam 160 is rotatably driven, a predetermined metered volume of beverage base is pumped out through delivery tube 58 from the metering pump 29. If the flavor chosen by the customer is one compounded of beverage base and carbonated beverages, the cam 180 associated with the cam 100 actuates other circuitry designed to provide carbonated water for mixing with the beverage base. At the completion of a pumping cycle, latch 128 engages retainer 144 (which has been restored to its original position by the solenoid 150 when the latter was deenergized) thereby elfecting disengagement between cams 160, 120. At the same time, the timing cams and switches are adapted to deenergize motor 160, thereby indexing all the parts in their respective rest positions.

Thus, in completing the operational cycle, it is only necessary that the appropriate solenoid 150 be momentarily energized in order to accomplish the two previously described functions, namely, effecting engagement between cam-s 100, 120 for the appropriate metering pump,

and actuating the switch 214 in order to carry out the credit cancelling switching function hereinafter described in connection with the circuit diagram. Of course, if a nonflavored beverage has been selected (i.e., if solenoid 150' has been energized), only the second function is accomplished, that is, the switch 214 is actuated, but the metering pump 20 is not conditioned to perform a pumping Operation.

The electrical circuitry utilized in connection with the present invention is schematicaly illustrated in FIGURE 9. Means are provided for indexing the pumping mechanism in an established credit position upon the deposit, by a customer, of a predetermined value in coins. A pair of terminals T1, T2, are respectively connected to an AC. power source by a pair of leads L1, L2. Terminal T2 is connected with a syrup pump motor SPM (corresponding to the previously described motor 160) by a lead L3. Terminal T1 is connected with a terminal T3 by a lead L4, a normally opened vend switch VS, and a lead L5.

Vend switch VS forms a part of the coin equipment of the vending machine in which the syrup pumping device of the present invention is incorporated and is enclosed by a broken line CE schematically representing the coin equipment. In actual practice, more than one vend switch, such as switch VS, may be provided. For example, one switch may be provided which is adapted to be closed upon the deposit of a sufiicient value in coins. Another switch may be provided which is adapted to close in response a manual actuation by an operator so as to actuate the mechanism without the deposit of any coins. For simplicity, however, only a single switch VS is shown in the coin equipment CE.

A pulse relay PR is connected between terminals T2 and T3 by means of a lead L6, a lead L7, and terminal T4, a lead L8, a terminal T5, and a lead L9. Thus, when switch V8 is momentarily closed (for example, in re sponse to the deposit of a sufficient value in coins) a circuit can be traced from A.C. power terminal T1 through pulse relay PR to power terminal T2 via lead L4, closed switch CS, lead L5, terminal T3, lead L6, lead L7, terminal T4, lead L8, terminal T5, and lead L9. Thus when switch VS is momentarily closed, relay PR is energized.

The energization of relay PR causes a series of pulse relay switches PRSl-6 to reverse (in the drawing switches PRS1-6 are shown in their respective positions assumed when relay PR is de-energized). Closing of switch PRSl in response to the energization of relay PR serves to close a holding circuit for relay PR in the following manner. A lead L10 connects terminal T3 with switch PRSl, and switch PRSl is connected with a normally closed credit cancelling switch CCS by means of a lead L11. Power terminal T1 is connected with switch CCS by means of a lead L12, a normally opened safety switch SS, a lead L14, a terminal T7, and a lead L15.

Although switch SS is normally opened, it the mechanism in which the present invention is incorporated is properly prepared for operation, the switch SS is closed. For example, the switch (which is a schematic simplification of several switches which would be used in a normal vending machine) is opened if insufficient pressure is available in the system which supplies carbonated water, or if waste disposal containers are not properly positioned. However, normally the machine is in condition for operation, and thus switch SS is closed and terminal T7 is a power terminal.

By means of the previously described elements, a circuit can be traced from power terminal T2 through relay PR and closed switches PRSI and CCS to power terminal T7 when switch PRSl closes. In this manner, relay PR remains energized, even though the vend switch VS is only momentarily closed.

The opening of switch PRS2 (and the corresponding closing of switch PRS3) serves to condition the operation of a cup mechanism CM schematically shown in broken lines in the drawing. The operation of cup mechanism CM and the circuitry associated therewith will be described in detail hereinafter.

The opening of switch PRS4 (and the corresponding closing of switch PRSS) serves to energize syrup pump motor SPM in the following manner. Terminal T7 is connected with a terminal T8, and a lead L16 connects terminal T8 with the contact of switches PRS45. With relay PR deenergized, switch PRS4 is closed (as shown in the drawing). A lead L17 connects switch PRS4 with a normally opened syrup pump motor switch SMSl, the opening and closing of which is controlled by a cam driven by syrup pump motor SPM (as will hereinafter be described in detail). When relay PR is energized, switch PRS4 opens and switch PRSS closes, and a circuit can be traced from power terminal T8 to motor SPM by means of closed switch PRSS, a lead L18, a closed switch SMS2 (also controlled by motor SPM), and a lead L19. Since motor SPM is connected to power terminal T2 by a lead L3, motor SPM is energized when relay PR is energized.

As motor SPM rotates, it drives a syrup pump motor cam SMC (cam SMC corresponds to the previously described cam 170). A syrup pump motor cam follower SMF controls the position of switches SMS12. Cam SMC is configured to cause follower SMF to close switch SMSl (and hence open switch SMS2) after motor SPM has undergone approximately degrees of rotation. When switch SMS2 opens, motor SPM is deenergized since switch PRS4 is open. The described position of motor SPM corresponds to an established credit position.

The cup mechanism CM is actuated so as to dispense a cup prior to customer selection, so that a receptacle will be provided for the beverage that is ultimately formulated by the mechanism. Thus, the cup mecha nism CM is actuated by the energization of relay PR in the following manner. Energization of relay PR opens normally closed switch PRS2 and closes normally opened switch PRS3. Closing of switch PRS3 completes a circuit between power terminal T8 and a cup mechanism motor CMM as follows. A lead L connects terminal T8 with closed switch PRS3, and a lead L21 connects switch PRS3 with a normally closed cam motor switch CMS2. A lead L22 connects normally closed switch CMSZ with a terminal T10, and a lead L23 connects terminal T10 with motor CMM. Power terminal T5 is connected to motor CMM by a lead L24. Thus, motor CMM is energized when switch PRS3 is closed.

A cup motor cam CMC is driven by motor CMM, and a cup motor cam follower CMF controls the positions of a series of cup motor switches CMS1-3. At a predetermined point during the rotation of cup mechanism motor CMM, normally opened switches CMSI and 3 close and normally closed switch CMS2 opens. The rotation of motor CMM is adapted to effect the release of a beverage cup into the delivery area of the beverage vending mat chine prior to the reversal of switches CMS1-3. The reversal of switches CMS1-3 is the final step in establishment of credit, and conditions the mechanism for customer selection of a given beverage in the following manner.

After a cup has been dispensed, the motor CMM, cam CMC, and follower CMF cooperate to reverse switches CMS1-3. The opening of switch CMSZ open circuits the motor CMM. Closing of switch CMS1 conditions motor CMM for further revolution at a later point when credit is cancelled (as will hereinafter be described in detail) by means of a lead L25 which interconnects switch CMSI and switch PRS2.

The closing of switch CMS3 conditions the circuitry for beverage selection in the following manner. A lead L26 connects switch CMS3 and normally opened switch PRS6. Switch PRS6 is closed when pulse relay PR is energized so that a circuit can be traced from switch CMS3 through switch PRS6, and a lead L27 to a terminal T11. A circuit may thus be traced from terminal T11 through closed switch CMS3, lead L21, closed switch PRS3 (which is closed while relay PR is energized), lead L20 to power terminal T8. Thus, with relay PR energized and switch CMS3 closed, terminal T11 is a power terminal.

A plurality of flavor selection solenoids FSS1-4 are provided (solenoids FSS1-4 correspond in structure and function to the previously described solenoids 150). Circuits can be traced from power terminal T4 through each of the solenoids FSS14 in the following manner. A lead L28 connects terminal T4 and a terminal T12. A pair of leads L29, L30 respectively connect terminal T12 and a pair of terminals T13, T14. A lead L31 connects terminal T14 and solenoid FSSL A lead L32 connects terminal T14 and solenoid FSSZ. A lead L33 connects terminal T12 and solenoid F553, and a lead L34 connects terminal T13 and solenoid FSS4.

Power terminal T11 is connected to each of the solenoids FSS1-4 in the following manner. Terminal T11 is respectively connected to a pair of terminals T15, T16 by a pair of leads L35, L36. Terminal T15 is connected with a terminal T17 by a lead L37, and terminal T16 is connected with a terminal T18 by means of a lead L38. Terminal T17 is connected with solenoid FSS4 by means of a lead L39 and a normally opened flavor selection switch FSW4. Similarly, solenoid F883 is connected with terminal T15 by means of a lead L40 and a normally opened flavor selection switch FSW3. Likewise, solenoid FSSZ is connected with terminal T16 by means of a lead L41 and a normally opened flavor selection switch FSWZ. Solenoid FSSl is connected with terminal T18 by means of a lead L42 and a normally opened flavor selection switch FSWl. Thus, the closing of any one of the switches PSW1-4 causes the energization of the corresponding one of the solenoids FSS1-4 when switch CMS3 is closed and relay PR is energized (i.e., when credit is established) A nonflavored beverage solenoid NFS is provided (solenoid NFS corresponds to previously described solenoid A circuit can be traced from power terminal T4 to solenoid N'FS by means of lead L28, terminal T12, lead L29, terminal T13, and a lead L45. Power terminal T11 is connected to solenoid NFS by lead L35, terminal T15, lead L37, terminal T 17, a lead L46, and a normally opened nonflavored beverage selection switch NSW. Thus, the closing of switch NSW results in the energization of solenoid NFS when switch CMS3 is closed and relay PR is energized (i.e., when credit is established).

Solenoid 150' (corresponding to solenoid NFS shown in the FIGURE 9 circuit diagram) is provided in order to permit a customer to select a beverage consisting solely of carbonated water (i.e., without any beverage base such as a flavored syrup). Thus, solenoid 150 is not linked to a mechanical clutching arrangement for actuating a metering pump (such as one of the pumps 20). However, solenoid 150 must be provided in order to accomplish the other function performed by the solenoids 150 (i.e., initiation of a credit cancelling function) as will hereinafter be described.

As noted, solenoids FSS1-4 correspond to previously described solenoids 150 and solenoid NFS corresponds to solenoid 150. In addition, the credit cancelling switch CCS corresponds to the previously described switch 214. Energization of any of the solenoids 150, 150 results in the actuation of switch 214 by means of the reciprocable bar 200. As schematically shown by the broken lines in the drawing, energization of each of the solenoids FSSl- 4 and NFS is adapted to cause normally closed credit cancelling switch CCS to open. The opening of switch CCS open circuits the previously described holding circuit for relay PR. With switch CCS opened, the opening of switch CCS is adapted to perform a credit cancelling function in the following manner. Thus, switch CCS is momentarily opened when one of the solenoids and NFS switches FSW1-4 and NSW is closed so as to pulse energize one of the corresponding solenoids FSS1-4 and NFS. The closing of switches FSW1-4 and NSW corresponds to the manual manipulation of a flavor selection button by a customer.

As noted, the energization of solenoids 150, in addition to causing actuation of switch 214, also engages the clutching mechanism for a given one of the metering pumps 20 whereby when staft 78 is rotated by motor 160, the metering pump 20 will pump a predetermined metered amount of beverage base out through delivery tube 58 from whence it is delivered to a previously dispensed beverage cup. Thus, in order for the beverage dispensing function of entire unit to proceed, the syrup pump motor SPM must be reenergized following flavor selection by the customer so that the metering pump 20 corresponding to the selected flavor will be actuated. In addition, other cams provided on shaft 78 (for example, cams 171-173 and as previously noted) control the operations of various other components of the beverage dispensing machine in which the device 12 is incorporated.

For example, reenergization of motor SPM subsequent to flavor selection by the customer, in addition to resulting in the pumping of the appropriate flavor of beverage base, also controls the dispensation of carbonated or plain water with which the base is mixed to compound the final beverage. Thus, the operation of the pumping device of the present invention, in addition to performing a pumping function, also performs a central control function with respect to the remaining portions of the beverage vending apparatus.

The opening of switch CCS is adapted to perform a credit cancelling function in the following manner. The opening of switch CCS open circuits the previously described holding circuit for relay PR. With switch CCS opened (and vend switch VS also opened), relay PR is deenergized, the relay switches PRS1-6 reversing (i.e., occupying the positions shown in the drawing) in response thereto. Switch PRSl which is a part of the relay holding circuit opens, and thus relay PR is not reenergized when switch CCS closes after being momentarily closed by the energization of one of the solenoids F881- 4 and NFS.

The closing of switch PRSZ and the opening of switch PRS3, in response to the deenergiz-atioin of relay PR, serves to condition the cup motor CMM for reenergization in order to restore the cup mechanism CM to its initial position. The closing of switch PRS2 completes a circuit between terminal T8 and terminal T10 (in order to energize motor CMM) in the following manner. Normal- 1y opened switch CMSl is held closed by cam CMC and follower CMF so that a circuit can be traced from terminal T10 to terminal T8 by means of closed switch CMSl, lead L25, closed switch PRS2, and lead L20. Thus, motor CMM is reenergized and rotates until returned to its rest position. At that point, cam CMC and follower CMF cooperate to cause the switches SMS1-3 to reverse (i.e., occupy the normal positions shown in the drawing). Thus, switches CMS1 and 3 open and switch CMS2 closes. The opening of switch CMSl open circuits motor CMM so that the cup mechanism CM is indexed in its rest position.

The credit cancelling function performed by the opening of switch CCS serves to reenergize motor SPM in the following manner. The opening of switch PRSS and the corresponding closing of switch PRS4, in response to the deenergization of relay PR, serves to reenergize motor SPM, since switch SMS1 is closed and switch SMSZ is opened at the established credit stage. Accordingly, a circuit can be traced from power terminal T8 through closed switch PRS4, lead L17, closed switch I SMSI, and lead L19 to motor SPM, which is connected to power terminal T2 by lead L3. Thus, motor SPM begins to rotate and the various pumping and control functions are carried out in the previously described manner. As has previously been explained, the initial revolution of motor SPM (corresponding to the establishment of credit) only amounted to about 10. After reenergization of the motor SPM, it continues to rotate through about 350 in performing the various pumping and control functions. After it has completed these functions, the cam SMC and follower SMF are adapted to index the motor in its initial position by opening switch SMSl and closing switch SMSZ. The opening of switch SMSl open circuits the motor (since switch PRSS is also open) resulting in the deenergization thereof.

The various switches, cams, and relays, are at this point disposed in their respective rest position and the operational cycle may be repeated.

The over-all operation of the present invention may now be briefly described. Upon deposit of coins of sufiicient value, the vend switch VS momentarily closes, thereby energizing relay PR. Energization of relay PR causes the motor SPM (160) to rotate through approximately 10 in order to index itself in an established credit posi- 12 tion, at which point the cam SMC (170) opens switch SMS2 in order to deenergize the motor.

The energization of relay PR further serves to actuate the cup mechanism CM which proceeds to dispense a beverage cup. When the beverage cup has been appropriately dispensed, the cup motor CMM is deenergized by means of cam CMC and follower CMF. Cam CMC and follower CMF also perform switching functions (i.e., the closing of switch CMS3) in order to condition the device for customer selection. When the customer selects his appropriate flavor (by closing one of the switches FSWI- 4 and NSW) a corresponding one of the solenoids FSS1- 4 (150) and NFS (150') is energized.

The energization of one of the solenoids FSSl-4 (150) serves to engage the cams 100, of the metering pump 20 associated with the selected flavor so that when the syrup pump motor SPM is reenergized, a metered amount of the selected flavor of syrup will be pumped into the previously dispensed beverage cup. However, if solenoid NFS is energized, no metering pump is actuated since the beverage to be dispensed consists of carbonated water without a flavored beverage base. It will be obvious to one skilled in the art that means may be provided in connection with the nonflavored selection equipment for the purpose of supplying an extra amount of carbonated water in order to compensate for the loss of volume of the beverage due to the fact that a beverage base is not incorporated therein.

Energization of one of the solenoids FSS14 (150) and NFS (150') also serves to momentarily open switch CCS (214) in order to perform a credit cancelling function. The opening of switch CCS results in the deenergization of relay PR, thereby reversing the switches PRS1-6. Reversal of these switches, reenergized the cup mechanism CMM and the syrup pump motor SPM so that the motors may respectively complete their respective cycles of revolution. As motor SPM (160) completes its rotation, one of the metering pumps 20 is actuated (if a flavored beverage has been selected) so as to pump a metered amount of beverage base into the previously dispensed cup. Additionally, the rotation of motor SPM (160) accomplishes various other central control functions (e.g., dispensation of an appropriate amount of carbonated or plain water, or crushed ice, etc.) by means of the other cams 171173 and 180. At the com pletion of the respective cycles of revolution, motors CMM and SPM are deenergized by a switching function performed by the corresponding cams and follower.

It can thus be seen that the pumping device of the present invention provides a number of meritorious advances. In addition to providing a novel electromechanical clutching arrangement whereby one of a series of metering pumps can be drivingly engaged by a drive shaft driven by a single source of motive power, various central controlling functions are also accomplished. The operation of the cup mechanism is controlled thereby; the dispensation and selection of carbonated water or plain water is controlled thereby; and the dispensation of ice is controlled thereby. Thus, one relatively compact unit may accomplish a number of different functions which have heretofore necessitated many different pieces of equipment.

It will be obvious to one skilled in the art that other metering pumps 20, in addition to the four shown in the exemplary embodiment hereinbefore described, can be provided in association with the single motor and drive shaft. Thus, one could provide a beverage vending machine having six, eight, ten, or even a dozen possible flavor selections simply by increasing the number of metering pumps and clutch mechanisms.

It should be understood that various changes and modifications may be made in the details of construction, arrangements, and operations of the various elements, without departing from the spirit and scope of the instant invention, as defined in the appended claims.

We claim:

1. A device adapted to selectively pump metered volumes of liquids comprising:

a plurality of metering pumps, each one thereof including a pumping chamber and reciprocable piston means for altering the effective volume of the pumping chamber;

drive means;

a plurality of clutching means, one thereof in association with each rneterin pump, each clutching means being adapted, when actuated, to effect driving engagement between the reciprocable piston means of its corresponding metering pump and the drive means, whereby the drive means causes the piston means to reciprocate;

a plurality of retaining means, one associated with each clutching means, each retaining means being adapted to normally maintain said clutching means in a declutched position, wherein the associated piston means is disengaged fromthe drive means;

momentary actuation of said retaining means being adapted to actuate the clutching means whereby the associated piston means is drivingly engaged with the drive means;

deactuation of said retaining means after momentary actuation thereof being adapted to deactuate the associated clutching means and thereby to disengage the piston means from the drive means after one full piston reciprocation has been completed; and

selective means for momentarily actuating at least one of the retaining means.

2. A device, as claimed in claim 1, and further comlng:

means for adjusting the length of thestroke of each piston means in order to varying the metered volume of liquid pumpable from the corresponding metering pump.

3. A device, as claimed in claim 1, wherein the selective means for actuating the retaining means includes:

means for conditioning the plurality of retaining means for actuation; and

means adapted to actuate momentarily a predetermined one of the retaining means when the plurality of retaining means are conditioned for actuation.

4. A device adapted to selectively pump metered volumes of liquids comprising:

a plurality of metering pumps, each one thereof including a pumping chamber and a reciprocable piston for altering the effective volume of the pumping chamber;

a drive shaft;

a plurality of first cam pump, mounted on the with;

a plurality of second cam means, one for each metering pump, mounted on the drive shaft for rotation with respect thereto, each second cam means having a cam surface;

follower means in association with each piston and adapted to cooperate with the cam surface of the corresponding second cam means whereby rotation of the second cam means causes the associated piston to reciprocate in the pumping chamber;

a plurality of clutch means, one for each metering pump, each clutch means being adapted, when released, to effect driving engagement between the corresponding first and second cam means;

a plurality of retaining means, one for each clutch means, each retaining means being adapted to normally maintain the corresponding clutch means in a declutched position wherein the associated first and second cam means are disengaged, and each of the retaining means being adapted upon actuation to release the said clutch means to a clutching position means, one for each metering drive shaft for rotation therewherein the associated first and second cam means are drivingly engaged; means adapted to actuate a predetermined one of the retaining means; and means for rotating the drive shaft.

5. A device, as claimed in claim 4, wherein each follower means includes:

a first cam follower adapted to be engaged by the corresponding second cam means whereby rotation of the second cam means drives the piston in a first direction;

a second cam follower adapted to be engaged by the corresponding second cam means whereby the piston is driven in a second direction; and

15 means for adjusting the relative positions of the first and second cam followers so as to adjust the length of the stroke of the associated piston in order to vary the metered volume of liquid pumpable from the pumping chamber. 6. A device adapted to selectively pump metered volumes of liquids in a coin-operated beverage vendor comprising:

a plurality of metering pumps, each including a pumping chamber and a reciprocable piston for altering the effective volume of the pumping chamber;

a drive shaft;

a plurality of first cam means, one for each metering pump, mounted on the drive shaft for rotation there with;

a plurality of second cam means, one for each metering pump, mounted on the drive shaft for rotation with respect thereto;

follower means in association with each piston and adapted to be engaged by the corresponding second cam means whereby rotation of the second cam means causes the piston means to reciprocate in the pumping chamber;

a plurality of clutch means, one for each metering pump, each clutch means being adapted, when released, to effect driving engagement between the corresponding first and second cam means;

a plurality of retaining means, one for each metering pump, each retaining means being adapted to normally maintain the associated clutch means in a declutched position wherein the associated first and second cam means are disengaged from one another, actuation of each of the retaining means being adapted to release the associated clutch means to a position wherein the associated first and second cam means are in driving engagement;

means responsive to the establishment of credit in the vendor for conditioning the plurality of retaining means for actuation;

selection means adapted to actuate a predetermined one of the retaining means when the plurality of retaining means are conditioned for actuation; and

means for rotating the drive shaft.

7. A device, as claimed in claim 6, wherein each follower means includes:

a first cam follower adapted to be engaged by the corresponding second cam means whereby rotation of the second cam means drives the piston in a first direction;

a second cam follower adapted to be engaged by the associated second cam means whereby the piston is driven in a second direction; and

means for adjusting the relative positions of the first and second cam followers so as to adjust the length of the stroke of the associated piston in order to vary the metered volume of liquid pumpable from the pumping chamber.

8. A device, as claimed in claim 6, wherein the selection means includes:

means adapted to deactuate a given retaining means 75 after momentary actuation thereof.

9. A device, as claimed in claim 6, wherein the means for rotating the drive shaft includes an electric motor and wherein the device further comprises means respon- .10. A device adapted to selectively pump metered volumes of liquids in a coin-operated beverage vendor comprising:

a frame;

a plurality of metering pumps on the frame, each metering pump including a pumping chamber and a reciprocable piston for altering the effective volume of the pumping chamber;

a drive shaft journaled in the frame for rotation with respect thereto;

a plurality of first cams, one for each metering pump, mounted on the drive shaft for rotation therewith, latch receiving means being provided on each first cam;

a plurality of second cams, one for each metering pump, mounted on the drive shaft for rotation with respect thereto;

a first cam follower in association with each piston, each first cam follower being adapted to be engaged by the associated second cam whereby rotation of the second cam causes the piston to move in a first direction;

a second cam follower in association with each piston,

each piston cam follower being adapted to be engaged by the associated second cam whereby rotation of the said second cam causes the associated piston to move in a second direction;

means for adjusting the relative distance between the associated first and second cam followers in order to vary the metered volume of liquid pumpable from the corresponding pumping chamber;

a plurality of latch members, each latch member being pivotally mounted on a corresponding second cam for rotation between a first position wherein it is disengaged from the corresponding first cam and a second position wherein it is engagable with the latch receiving means on the said first cam;

biasing means for urging each latch member toward its second position;

a plurality of retaining members, one for each latch member, each retaining member being adapted to normally maintain its associated latch member in its first position, actuation of each of the retaining member being adapted to release the corresponding latch member for rotation to its second position under the urging of the associated biasing means;

means responsive to the establishment of credit for conditioning the plurality of retaining members for actuation;

selection'means adapted to actuate a predetermined one of the retaining members when the plurality of retaining members are conditioned for actuation;

.an electric motor adapted to cause the rotation of the drive shaft; and

means responsive to the establishment and removal of credit for controlling the operation of the electric motor.

11. A device, as claimed in claim 10, wherein:

each retaining member is slidably mounted on the frame for movement between a first position, in which the associated latch member is normally maintained in its first position, and a second position, in which the latch member is released for rotation to its second position; and

the selection means comprises a plurality of solenoids, one for each retaining member, each solenoid being operatively connected to an associated retaining member, whereby momentary energization of the solenoid momentarily moves the associated retaining member from its first to its second position, and means for momentarily energizing a predetermined one of the solenoids when the retaining members are conditioned for actuation.

12. A device, as claimed in claim 11, and further comprising:

a plurality of third cams mounted on the drive shaft for rotation therewith, each of the said third cams being adapted to perform a controlled switching function when it undergoes rotation with the drive shaft; and

a plurality of fourth cams, one for each second cam, each fourth cam being mounted on the drive shaft for rotation with respect thereto and each fourth cam being adapted to rotate as a unit with its associated second cam, the said fourth cams being adapted to perform a controlled switching function when it undergoes rotation with its associated Second cam.

13. A device adapted to selectively pump metered volumes of liquids comprising:

a'plurality of metering pumps, each one thereof including a pumping chamber and reciprocable piston means for altering the efiective volume of the pumping chamber, said piston means being reciprocable between a rest position and a raised position within the pumping chamber;

means in association with each piston for adjusting the length of the piston stroke by adjusting the raised position of the piston stroke, without changing the rest position of the piston stroke, whereby variation in the metered volume of liquid pumpable from the corresponding metering pump may be obtained;

drive means;

a plurality of clutching means, one thereof in association wtih each metering pump, each clutching means being adapted, when actuated, to effect a positive driving engagement between the reciprocable piston means of its corresponding metering pump and the drive means, whereby the drive means positively drives the piston means in said first and second directions and the piston means is thereby caused to reciprocate;

a plurality of retaining means, one associated with each clutching means, each retaining means being .adapted to normally maintain said clutching means in a declutched position, wherein the associated piston means is disengaged from the drive means;

momentary actuation of said retaining means being adapted to actuate the clutching means whereby the associated piston means is drivingly engaged with the drive means;

deactuation of said retaining means after momentary actuation thereof being adapted to deactuate the associated clutching means and thereby disengage the piston means from the drive means after one full piston reciprocation had been completed; and selective means for momentarily actuating at least one of the retaining means.

References Cited UNITED STATES PATENTS 1,494,764 5/1924 Wishart 103-38 2,008,850 7/1935 Brown 22276 3,363,571 1/1968 Reynolds et al. 10323 FOREIGN PATENTS 114,741 10/ 1929 Austria.

WILLIAM L. FREEH, Primary Examiner. 

